package endpoints

import (
	"encoding/base64"
	"errors"
	"net/http"
	"strconv"

	httperror "github.com/portainer/libhttp/error"
	"github.com/portainer/libhttp/request"
	"github.com/portainer/libhttp/response"
	"github.com/portainer/portainer/api"
	bolterrors "github.com/portainer/portainer/api/bolt/errors"
)

type stackStatusResponse struct {
	ID      portainer.EdgeStackID
	Version int
}

type edgeJobResponse struct {
	ID             portainer.EdgeJobID `json:"Id"`
	CollectLogs    bool                `json:"CollectLogs"`
	CronExpression string              `json:"CronExpression"`
	Script         string              `json:"Script"`
	Version        int                 `json:"Version"`
}

type endpointStatusInspectResponse struct {
	Status          string                `json:"status"`
	Port            int                   `json:"port"`
	Schedules       []edgeJobResponse     `json:"schedules"`
	CheckinInterval int                   `json:"checkin"`
	Credentials     string                `json:"credentials"`
	Stacks          []stackStatusResponse `json:"stacks"`
}

// GET request on /api/endpoints/:id/status
func (handler *Handler) endpointStatusInspect(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
	endpointID, err := request.RetrieveNumericRouteVariableValue(r, "id")
	if err != nil {
		return &httperror.HandlerError{http.StatusBadRequest, "Invalid endpoint identifier route variable", err}
	}

	endpoint, err := handler.DataStore.Endpoint().Endpoint(portainer.EndpointID(endpointID))
	if err == bolterrors.ErrObjectNotFound {
		return &httperror.HandlerError{http.StatusNotFound, "Unable to find an endpoint with the specified identifier inside the database", err}
	} else if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to find an endpoint with the specified identifier inside the database", err}
	}

	err = handler.requestBouncer.AuthorizedEdgeEndpointOperation(r, endpoint)
	if err != nil {
		return &httperror.HandlerError{http.StatusForbidden, "Permission denied to access endpoint", err}
	}

	if endpoint.EdgeID == "" {
		edgeIdentifier := r.Header.Get(portainer.PortainerAgentEdgeIDHeader)
		endpoint.EdgeID = edgeIdentifier

		agentPlatformHeader := r.Header.Get(portainer.HTTPResponseAgentPlatform)
		if agentPlatformHeader == "" {
			return &httperror.HandlerError{http.StatusInternalServerError, "Agent Platform Header is missing", errors.New("Agent Platform Header is missing")}
		}

		agentPlatformNumber, err := strconv.Atoi(agentPlatformHeader)
		if err != nil {
			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to parse agent platform header", err}
		}

		agentPlatform := portainer.AgentPlatform(agentPlatformNumber)

		if agentPlatform == portainer.AgentPlatformDocker {
			endpoint.Type = portainer.EdgeAgentOnDockerEnvironment
		} else if agentPlatform == portainer.AgentPlatformKubernetes {
			endpoint.Type = portainer.EdgeAgentOnKubernetesEnvironment
		}

		err = handler.DataStore.Endpoint().UpdateEndpoint(endpoint.ID, endpoint)
		if err != nil {
			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to Unable to persist endpoint changes inside the database", err}
		}
	}

	settings, err := handler.DataStore.Settings().Settings()
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve settings from the database", err}
	}

	tunnel := handler.ReverseTunnelService.GetTunnelDetails(endpoint.ID)

	checkinInterval := settings.EdgeAgentCheckinInterval
	if endpoint.EdgeCheckinInterval != 0 {
		checkinInterval = endpoint.EdgeCheckinInterval
	}

	schedules := []edgeJobResponse{}
	for _, job := range tunnel.Jobs {
		schedule := edgeJobResponse{
			ID:             job.ID,
			CronExpression: job.CronExpression,
			CollectLogs:    job.Endpoints[endpoint.ID].CollectLogs,
			Version:        job.Version,
		}

		file, err := handler.FileService.GetFileContent(job.ScriptPath)

		if err != nil {
			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve Edge job script file", err}
		}

		schedule.Script = base64.RawStdEncoding.EncodeToString(file)

		schedules = append(schedules, schedule)
	}

	statusResponse := endpointStatusInspectResponse{
		Status:          tunnel.Status,
		Port:            tunnel.Port,
		Schedules:       schedules,
		CheckinInterval: checkinInterval,
		Credentials:     tunnel.Credentials,
	}

	if tunnel.Status == portainer.EdgeAgentManagementRequired {
		handler.ReverseTunnelService.SetTunnelStatusToActive(endpoint.ID)
	}

	relation, err := handler.DataStore.EndpointRelation().EndpointRelation(endpoint.ID)
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve relation object from the database", err}
	}

	edgeStacksStatus := []stackStatusResponse{}
	for stackID := range relation.EdgeStacks {
		stack, err := handler.DataStore.EdgeStack().EdgeStack(stackID)
		if err != nil {
			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve edge stack from the database", err}
		}

		stackStatus := stackStatusResponse{
			ID:      stack.ID,
			Version: stack.Version,
		}

		edgeStacksStatus = append(edgeStacksStatus, stackStatus)
	}

	statusResponse.Stacks = edgeStacksStatus

	return response.JSON(w, statusResponse)
}
